Malicious PDF — malware analysis report

Static analysis result for SHA-256 6426192b8e2ffb19…

MALICIOUS

PDF

93.0 KB Created: 2021-09-17 07:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e801da7dffdf32b060e0aa0bd3b093eb SHA-1: e17febfa3e46343fc9bd84fbbb2e2145f604a340 SHA-256: 6426192b8e2ffb190b8f6cc394f4efcf21ca9aa57294a457c8ed0f5fbf632b2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://irlanc.ru/uplcv?utm_term=watch+spider+man+homecoming+full+movie+free PDF link annotation
    • http://shengyaweb.com/uploadfile/file/2021090418273852.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/60978929388.pdfIn PDF document text
    • https://renetravel.ro/images/files/49018617541.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/xalopozapofonowokopetevum.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/95916610931.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/fozew.pdfIn PDF document text
    • http://air-ned.com/uploads/files/17255624089.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/vokogak.pdfIn PDF document text
    • http://contelex.it/userfiles/files/tuguseve.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305ebcb299e---xamivafu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141cf10c4149---6207700911.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de073bf175---2916799533.pdfIn PDF document text
    • http://wernitznigg.at/files/80588585414.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/88939976265.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/suporamijonutefodez.pdfIn PDF document text
    • https://dalba.net/other_files/File/44308591901.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/70312736362.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16138037e1bcdb---folefawoxusivexa.pdfIn PDF document text
    • https://conrays.ru/f/data/92836848855.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/47577648782.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c04e65842f---69166417842.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/95856980673.pdfIn PDF document text
    • https://andhimazhai.com/images/files/sisusanekapefekebanepu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7b816dacd79cb7c2f1731c020dd61f5e/24437663047.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001047e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C95 11224 bytes
SHA-256: 966e4694646516d621d97f79ea50c54699653838d705b91421692b56cde40ff0
font_02_sfnt_off0001368a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 18020 bytes
SHA-256: 7b1eb3cb3fb7a447f08c4630425de9ce6f9b02566ef23281dbc20e01b5e73f5b

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